“…Within the biosensor's linear range (10-230 U/ml), the accuracy (R 2 = .989), the precision established by inter-run measurements of saliva samples taken with the same device (the coefficient of variation < 9%), and measurement repeatability (range À3.1% to +3.1%) of this type of handheld monitor has been found to approach that of more elaborate laboratory-based automated clinical chemistry analysis tools (Olympus America Inc., Center Valley, PA, USA) (Shetty, Zigler, Robles, Elashoff, & Yamaguchi, 2011). Salivary a-amylase was measured from saliva samples collected under the tongue by inserting the reagent test strip directly into the subject's oral cavity.…”